Sudoku

How to play

1. Select an editable cell, then choose a digit from the number buttons or type it. Arrow keys move the selection; Erase, Backspace, or Delete clears it.
2. Turn Notes on (or press N while on the board) to save possible digits in a cell. Choose a note again to remove it. Entering a number clears that cell's notes and removes that digit from related row, column, and box notes.
3. Given digits stay fixed. Repeating a digit in a row, column, or box is rejected without changing your saved board.
4. An accepted entry is not a hint that the digit is correct. The puzzle completes when the entire grid is correct.

Practice

Practice saves your current attempt. Start a new practice puzzle when you want a fresh one. Practice results do not change Elo.